Past, present and future. Zenith invites you on a journey through time with El Primero. Since January 10th 1969, birth date of the famous El Primero chronograph, Zenith has shone brightly in the firmament of high frequency. ln homage to the legendary destiny of El Primero, the world’s first integrated and most accurate automatic chronograph, Zenith is presenting a celebratory collector’s boxed set containing three 50-piece limited edition El Primero models. It retraces the technical and aesthetic evolution as well as the future of high frequency.